How to find the indexpath on alertview?

Question

Hi i am working with the tableview.Now i am facing one issue. in my tableview when i use Long Gesture i need to display Alert View.it is working fine.when i click on buttonindex 0 in alert view i need to perform some Task.But in that i need indexpath. Below is my method for perform task

UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
                                      initWithTarget:self action:@selector(messageDeleteOrForword:)];
lpgr.minimumPressDuration = 2.0; //seconds
lpgr.delegate = self;
[self.tableView addGestureRecognizer:lpgr];

}
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {

if (buttonIndex == 0) {
  [self deleteSpecificMessage];

}
if (buttonIndex==1) {

}
}

 -(void)messageDeleteOrForword:(UILongPressGestureRecognizer *)gestureRecognizer
 {
   UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Delete" message:@"Do you want to delete specific message" delegate:self cancelButtonTitle:@"Delete" otherButtonTitles:@"Forword", nil];
[alert show];
}


-(void)deleteSpecificMessage
{

 CGPoint p = [gestureRecognizer locationInView:self.tableView];
  NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:p];
}

but i need to pass some parameter to know the indexpath for that i use below line -(void)deleteSpecificMessage:(id)sender { } But how to call and assign parameter in alertview Please help me.

Post some code for the Long Gesture please. – Manolis Karamanis Apr 21 '16 at 08:06 — Manolis Karamanis, Apr 21 '16 at 08:06
can you please check updated one – Bittoo Apr 21 '16 at 08:15 — Bittoo, Apr 21 '16 at 08:15

Ketan Parmar · Answer 1 · 2016-04-21T08:34:06.547

show alert view from didselectrowatindexpath. set alertview tag as indexpath from this method. by that way you will integrate your alertview with indexpath. in alertview delegate you can got indexpath as it's tag. so you can use this tag to delete it or forward it as considering indexpath.

forexample :

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

  UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Delete" message:@"Do you want to delete specific message" delegate:self cancelButtonTitle:@"Delete" otherButtonTitles:@"Forword", nil];

 alert.tag = indexPath;  //setting tag

 [alert show];
}

Update (as ask in comment):

you can do something like this, here is an example,

UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
                                      initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = 2.0; //seconds
lpgr.delegate = self;
[self.myTableView addGestureRecognizer:lpgr];

here handleLongpress method

 -(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
 CGPoint p = [gestureRecognizer locationInView:self.myTableView];

NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:p];
if (indexPath == nil) {
    NSLog(@"long press on table view but not on a row");
}
else{

    UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Delete" message:@"Do you want to delete specific message" delegate:self cancelButtonTitle:@"Delete" otherButtonTitles:@"Forword", nil];

    alert.tag = indexPath;  //setting tag

    [alert show];
}

}

hope this will help :)

CGPoint p = [gestureRecognizer locationInView:self.myTableView]; You will get CGPoint from tableview, now as per row height you can calculate index and which shall has been long tapped. — Hasya, Apr 21 '16 at 09:56

score 0 · Answer 2 · answered Apr 21 '16 at 08:23

0

In your delete method you could add this:

CGPoint location = [gestureRecognizer locationInView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:location];
UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:indexPath];

answered Apr 21 '16 at 08:23

Manolis Karamanis

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but what about gestureRecognizer? – Bittoo Apr 21 '16 at 08:27

score 0 · Accepted Answer · edited May 23 '17 at 11:59

You can get indexpath using

NSIndexPath *selectedIndexPath = [tableView indexPathForSelectedRow];

You can check more details from this link

Also you can take a IndexPath variable in .h file which can be assigned while selecting the tableview cell.

First of all Add your long tap gesture recognizer.

UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(actionLongPressGeature:)];
[longPressGesture setDelegate:self];
[longPressGesture setMinimumPressDuration:0.3];
[tableView addGestureRecognizer:longPressGesture];

i.e Option 1

-(void)actionLongPressGeature:(UILongPressGestureRecognizer *)gestureRecognizer
{
    CGPoint p = [gestureRecognizer locationInView:tableViewJobs];
   // You need to declare NSIndexPath *indexPathSelected in your .h File
    indexPath = [tableView indexPathForRowAtPoint:p];
    if (indexPath == nil) {
        NSLog(@"long press on table view but not on a row");
    }
    else if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
    {
            // Perform your action i.e AlertView
    }
}

Option 2:

-(void)actionLongPressGeature:(UILongPressGestureRecognizer *)gestureRecognizer
{
        // You need to declare NSIndexPath *indexPathSelected in your .h File
    indexPath = [tableView indexPathForSelectedRow];
    if (indexPath == nil) {
        NSLog(@"long press on table view but not on a row");
    }
    else if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
    {
        // Perform your action i.e AlertView
    }
}

and later on you can use this variable.

I hope this is you what you are looking for.

Please accept my question it is use full for some one else Thank you — Bittoo, Apr 21 '16 at 11:05

score 0 · Answer 4 · answered Apr 21 '16 at 08:56

-(void)messageDeleteOrForword:(UILongPressGestureRecognizer *)gestureRecognizer
 {   
     CGPoint p = [gestureRecognizer locationInView:self.myTableView];

     NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:p];
     if (indexPath == nil) {
        NSLog(@"long press on table view but not on a row");
     }
     else{

        NSLog(@"selected row index %ld",(long)indexPath.row);

        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Delete" message:@"Do you want to delete specific message" delegate:self cancelButtonTitle:@"Delete" otherButtonTitles:@"Forword", nil];
        [alert show];
     } 


 }

score 0 · Answer 5 · answered Apr 23 '16 at 11:21

You can also use Objective-C Associated Objects for runtime properties. This features is available in <objc/runtime.h>. For Example:

#import <objc/runtime.h>

-(void)messageDeleteOrForword:(UILongPressGestureRecognizer *)gestureRecognizer
{
   UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Delete" message:@"Do you want to delete specific message" delegate:self cancelButtonTitle:@"Delete" otherButtonTitles:@"Forword", nil];
   objc_setAssociatedObject(alert, @"currentIndexPath", indexPath, OBJC_ASSOCIATION_RETAIN);
   [alert show];
}


- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex 
{
   NSIndexPath *idxPath = objc_getAssociatedObject(alertView, @"currentIndexPath");
   NSLog(@"%@",idxPath);

   if (buttonIndex == 0) {
      [self deleteSpecificMessage];
   }

   if (buttonIndex==1) {
   }
}

Here are some links which is more helpful. http://kingscocoa.com/tutorials/associated-objects/ http://nshipster.com/associated-objects/

Using associate object you can attached multiple properties with any object and get easily. In first link you can also customize properties with defining Category.

How to find the indexpath on alertview?

5 Answers5